Packing.



PATENTED MAY 2, 1905.

E. 11. HARSEN.

PACKING.

APPLICATION FILED JAN.20,1905.

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STATES Patented May 2, 1905..

PATENT OEEICE.

EDWVARD D. HARSEN, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND CAJUS LEEDHAM, OF NEW YORK, N. Y.

PACKING- SPEGIFIGATION forming part of Letters Patent No. 788,769, dated May 2, 1905.

Application filed January 20, 1905. Serial No. 241,970.

To all whom, it may concern,-

Be it known that I, EDWARD D. I-IARsEN, of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Packing; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

To The object of this invention is to provide an improved simple and durable packing, especially designed for pistons, which will insure close contact between the piston and inner surface of the cylinder Without producing excessive friction and which will preclude the possibility of leakage of the steam, air, water, gas, or other motive fluid which may be employed.

In the accompanying drawings, Figure l is a sectional view of a piston equipped with my improvements. Fig. 2 is a side elevation, partly in section, of the packing. Fig. 8 is a fragmentary view of the parts removed.-

Referring to the drawings, 1 designates a 2 5 piston having a piston-head 2 and followerplate 3, both of greater diameter than the body portion of the piston to provide circumferential flanges intermediate which the packing i is accommodated.

5 is a flexible metallic ring, of any preferred material, preferably rolled or turned from a single strip to provide its circular formation and an inner groove or channel 6, whose walls are right angular. Thus the ring has suflicient bearing-surface against the wall of the cylinder and against the adjacent rings, but is resilient to a degree insuring effective contact. The ring is split, and its meeting extremities are preferably formed with over- 4 lapping tongues, as indicated at 7 8 is an expansion-ring designed to be accommodated by the channel 6 of ring 5 and corresponding in cross-sectional formation to that of the channel. This expansion-ring is also split. and its meeting extremities are preferably arranged at a point away from the split portion of ring 5. The expansionring is designed to entirely fill the channel 6, its

thickness equaling the depth of the channel, although, if desired, two expansion-rings may be employed and the channel be equal to their combined thickness. It is essential, however, that the expanding medium be free to be moved Within the channel, so that its ends may be located at any desired point with relation to the split portion of ring 5. Ordinarily an equal degree of expansion of ring5 at all portions of its periphery is best effected by arranging the ends of the expansion-ring at a point of ring 5 farthest from the ends of the latter, while under other circumstances, as when it is desirable to have a slightly greater degree of expansion at one point than throughout the balance of the ring, the ends of the two rings may be placed in alinement.

Intermediate the packing and the body of the piston I have shown aiilling 9, of any preferred yielding material, such as rubber or flexible packing, the purpose of which is to provide an appropriate cushion for the packing and prevent leakage.

It will be noted that the approximate bowspring shape of the packing will insure its exerting either an outward or inward pressure, according as it is pressed inward, as by the cylinder-wall, or by being sprung apart and placed over a circular body of greater diameter than the normal diameter of the ring. This feature is enhanced by the grooved formation which allows sufficient resiliency and yet provides space for the expansion medium.

The packing-rings may be made of various sizes and different widths, so as to insure their filling the space between the piston-head and follower-plate. They may be cheaply manu- 5 factured and require less skill in workmanship than the piston-packing heretofore em ployed.

I claim as my invention 1. The herein-described metallic packing- 9 ring for pistons having a smooth or uninterrupted outer face designed to contact with the cylinder-wall and having a groove or channel in its inner face, and an expansion-ring accommodated by said groove and movable therein, for the purpose set forth.

2. The combination with a piston having a therein and having their inner faces bearing head and follower and an intermediate annuagainst said cushions. lar recess, of packing accommodated by said In testimony whereof I have signed this recess comprising aseries of yielding or fleXi' specification in the presence of two subscrib- 5 blle cushions surfounding the1 body porc'ltion of ing Witnesses.

t 1e piston, meta lic rings inc osing sai cushions, said rings having smooth or uninter- EDWARD H ARSEN' rupted outer faces and having grooves or lVitnesses: channels in their inner faces, and split rings FRANK NALLY, IO accommodated by said grooves and movable GRAFTON L. MOGILL. 

